Dell EMC E39S Series Installation And Service Manual page 22

Table 14. AC PSU status indicator codes (continued)
Power indicator codes
DC PSU status indicator
1. DC PSU status indicator
Table 15. DC PSU status indicator codes
Power indicator codes
Green
Blinking amber
Not illuminated
Blinking green
22 Dell EMC PowerEdge R640 overview
Condition
CAUTION: If two PSUs are used, they must be of the same type and have the same
maximum output power. Combining AC and DC PSUs is not supported and triggers a
mismatch.
Condition
A valid power source is connected to the PSU and the PSU is operational.
Indicates a problem with the PSU.
Power is not connected to the PSU.
When hot-plugging a PSU, the PSU indicator blinks green. This indicates that there is a PSU mismatch
with respect to efficiency, feature set, health status, or supported voltage.
CAUTION: If two PSUs are installed, both the PSUs must have the same type of label;
for example, Extended Power Performance (EPP) label. Mixing PSUs from previous
generations of PowerEdge servers is not supported, even if the PSUs have the same
power rating. This results in a PSU mismatch condition or failure to turn the system on.
CAUTION: When correcting a PSU mismatch, replace only the PSU with the blinking
indicator. Swapping the PSU to make a matched pair can result in an error condition and
unexpected system shutdown. To change from a High Output configuration to a Low
Output configuration or vice versa, you must turn off the system.
CAUTION: If two PSUs are used, they must be of the same type and have the same
maximum output power.
CAUTION: Combining AC and DC PSUs is not supported and triggers a mismatch.